User's Manual
Table Of Contents
- Customer Response Form
- Record of Revisions
- Service Bulletin List
- List of Effective Pages
- Introduction
- System Description
- System Operation
- 1. Registering and Activating Terminals
- 2. Using the A781-200 System
- 3. Channel Status and System Configuration
- 4. Maintenance Mode
- Installation
- Test and Fault Isolation
- Maintenance and Repair
- Appendix A: Return Material Authorization
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-200 SDU and SCM
23-15-30 3-2
DATE TBD
3. Installation Procedure
Only authorized technical personnel, trained in general aviation workmanship, that have a basic
understanding of SATCOM systems should proceed with the following procedure.
Before performing any installation procedures, read the safety advisories listed in "Advisories"
on page 3-1 of this manual.
CAUTION: THE ARINC 781-200 SYSTEM REQUIRES CONDITIONED AIR PER
ARINC781. SEE NOTE 4 0F FIGURE 3-3 ON PAGE 3–11.
1. Install the SDU in a 6 MCU tray as per ARINC 600. The minimum clearance between
the SDU and any other equipment installed above it shall be no less than 0.5 inches.
2. Install the SCM in any
orientation. Refer to Table 1-2 on page 1-5 for the SCM
mounting specification.
• There are no clearance requirements for the SCM.
3. Connect the SCM to the SDU. The SDU supports one RS-422 interface for
in
terconnect to the SCM.
4. Connect the SDU to the antenna subsystem. The SDU supports ARINC 429
com
munication to and from the antenna subsystem.
5. Connect the SDU to the MCDU(s). The SDU supports three ARINC 429 receive
in
terfaces and one ARINC 429 transmit interface for interconnect to the flight deck
MCDU(s).
4. Connection Details
A. SDU
The SDU uses two external interface connectors:
• Rear Connector—a low insertion force, size 2 shell receptacle accommodating
coa
xial and signal interconnections in the top plug insert, Quadrax and signal
connections in the middle plug insert, and coaxial and power interconnections in the
bottom plug insert. Pin assignments are compliant with ARINC Characteristic 781
with top plug and middle plug deviations as shown in Table 3-1.
• Front Connector—an RJ45 and 9S DSUB connector providing 10BT Ethernet
in
terfaces and an RS-232 maintenance interface. Pin assignments are shown in
Table 3-2. The front connector is behind a maintenance cover. This connector
provides access to maintenance and troubleshooting information when the SDU is
n
ot in normal operation.
Table 3-1 SDU Rear Connector Pin Deviations
Pin Number A781 Deviation
Top Plug Insert Pin Deviations
TP01A ATE pin 1 Router Processor Maintenance TXD
TP01B ATE pin 2 Router Processor Maintenance RXD